Facsimile transmission



April 14, l931- R. H. RANGER FACSIMILE TRANSMISSION Filed May 5, 1929INVENTOR R.H. RANGER ATTORNEY Patented pr. l14, 193B rauw RICHARDHOWLAND RANGER, F NEWARK, kNEW JERSEY, ASSIGNOR T0 RADIO COR- PORATION0F AMERICA', A CORPORATION OF DELAWARE FACSIMILE T RNSMISSIGNApplication led May 3, 1929. Serial No. 360,063.

need of constantly watching the reproductionand transmission todetermine the time length of operation.

More particularly, the invention is directed to an alarm system wherebyit is possible to provide an arrangement which will automatically turnoff the transmitter or receiver at the time when a picture has beentransmitted.

Therefore, as a primary object of my invention, l have sought to developa method and means by which the time when a'picture has been` recordedwill be indicated.

Still a further object of my invention has been to provide a systemwherein each successive line of reproduction of the picture willdetermine the time of indication of the alarmmeans and the time ofturning olf either or both the transmitter and receiver.

Still a further object of my invention is to provide an`-` alarm systemfor indicating the end ofthe time required for transmitting andreceiving fthe picture which is not directly dependent. upon any timeelement but which, on theother hand, is determined by the amount ofdetail desired in a transmitted and received picture.

Stili otherobjects of my invention are to provide in a manner to behereinafter set forth an arrangement for indicating the time when asingle transmission and reception of a picture has been completed whichis relatively simple in its construction and arrangement of parts, asystem which is cheap and convenient to install, a system which ishighly efficient in its use, readily operated, easily Set up, and whichcan be used in conjunction with substantiallv all known types oftransmitting and receiving apparatus for .facsimile developments.

Still other and ancillary objects of my in vention will become apparentand at once suggest themselves to those skilled in the art to which theinvention relates by making reference to the accompanying drawingsforming, together with the following specification and claims, a part ofmy disclosure.

By Fig. 1 of the drawings, l have illus trated in a conventional manneran alarm ,system as applied to either a facsimile transmittingorreceiving machine; and,

By Fig. 2, l have diagrammatically `illuselectrical system forindicating the time when a single transmission of a picture and the likeends.

-trated a suitable arrangement for wiring an In conjunction with thepresent disclosure,

reference may he had to my copending application, Serial No. 360,064,iled May 3, 1929, disclosing a prefered type of transmit `ting orreceiving apparatus with which the present invention may be associated.

Now referring particularly to Fig. 1 of the drawings, lf have provided;a cylinder or drum l upon `which a record surface for transmission, or alight or heat sensitive record for receiving a plcture may be mounted.As shown., the drum 1 is arranged to turn in the direction shownby thearrow thereon and may be driven by means of a drive gear 3 carried upona shaft 5 and turned through means of a worm gear 7 mounted and carriedby a spindle 9 which derives rotational movei I ment in the manner setforth in the above referred to copending application. The spindle 9 ispreferably mounted from brackets or other bearing surfaces 11 carriedupon an end frame work 13 for supporting the drum surface 1. As has beenshown, the end of the shaft 5 is provided with a knurled thumb nut 15 sothat the drum surface 1 may be easily turned in the direction of thearrow by simply turning the nut so that it may-be positioned at theproper point for starting the picture without the need of turning thedrive shaft 9. i

In order to prevent a backward motion of the drum 1 in the oppositedirection from that lshown for driving the same, I have provided aratchet wheel 17 and a spring mounted pawl 19 for engaging therewith.Mounted behind the main drive gear 3 carried by the shaft 5 for rotatingthe drum, I have provided a disk member 21 which' is frictionallycarried upon the shaft 5 so as to engage with the gear 3 and to berotated thereby in a corresponding direction. As will be seenparticularly in conjunction with Fig. 2 of the drawings, where the disk21 has been shown at a point substantially near the end of transmission,in contrast l to the position shown by Fig. 1 wherein the disk is eitherat the beginning or at the end of transmission, I have provided in thedisk surface 21 a notch 23 into which may engage a stop member 25pivoted yat a central point thereof 27 and arranged to form the armatureof a pair of relays 29 and 31 respectively. It will be seen that, wherethe relay 31 is energized, the arm 25 provided with the forked end 33will be turned in a clock-.wise direction as shown about the point ofsupport 27 as a pivot and when the disk 21 is in the position as shownby Fig. 1 that the forked projection 33 on the arm 25 will engage in theslot 23 of the disk and hold the same in such position. At such periodsof time, the disk 23 will slip with respect to the drive gear 3, sincethe friction from the drive gear upon the disk surface is not suiicientto pull the same in a clock-wise manner when the forked end of thearmature l 25 engages in the slot 23, so that the armature endlessspiral track reaches one end of its motion that it will close a contactarm 35 so as to cause the same to press against the contact point 37.The arm 35 is preferably connected at a terminal 39 with a negativepoint on the source of potential so that as the contact arm 35 movesover against the contact point 37 current will tend to flow. Therefore,for a starting position of the transmitting or receivingmachine, theswitch 39 may be thrown upon the contact 41 so that current will thenflow from the point of connection 39 through the contactl arm 35, thepoint of connection 37 through the switch arm 39, the Contact 41, theconductor 45, to the relayv coil 29, which has one end thereof connectedwith the conductor 45 and the other end connected to a terminal point 47to which positive potential from the same potential source connected at39 is connected. Thus, the relay 29 is energized and the armature 25moved in a counter clock-wise direction about the point 27 as a pivot sothat the forked projection 33 thereon is withdrawn from the slottedmember 23. The disk 21 isv now free to rotate in a clock-wise directionin accordance with rotational movement derived from the rotation of theshaft 9.

Immediately upon starting the drum 1 rotating by means ofthe drive shaft9, and at the time when the transmission of the picture has been startedby releasing the armature 25 from the slot 23, the switch arm 39 isthrown over upon a second contact point 43 so that current may then flowfrom the point of connection 39 of the negative source of potentialthrough the Contact arm 35 through the point of connection 37 throughthe switch arm 39, the contact point 43, the conductor 49 to the relaycoil 31, from whence it iows to the point of connection 47 of vthepositive source of potential. It will thus be seen,.as the carriagecarrying either the analyzingsystem for analyzing the picture in thecase of transmission, or the light responsive elements or heatresponsive elements in thecase of reception, longitudinally traversesthe recording drum 1 so as to project either light or heat upon therecord surface carried by the drum surface, that at each end of thelongitudinal stroke of the said scanning or reproducing system, thecontact arm 35 is closed against the contact point 37 and with theswitch arm 39 connected to contact 43 of the switch that the relay coil31 will be energized at each end of the stroke or at each time theanalyzing or re-` producing system has been moved longitudinally withrespect to the drum. Thus, the armature' 25 pivoted about the contactpoint 27 is moved in a clock-wise direction about the pivot pointtowards the relay coil 31 and tends to rest against the contact 51 so asto form a connection from a source of potential having its positiveterminal connected to the point of pivotal support 27 of the armature 25so that it may flow through the armature 27 to the contact point 51 orto the contact point 53. However, after the picture carrying drum 1 hasonce started to rotate, it may be readily seen, in case the picture isto be analyzed or reproduced in a diagonal manner, as shown anddescribed in connection with my copending application above referred to,Serial No. 360,064, iled May 3, 1929, that for each longitudinalmovement of the analyzing or reproducing carriage with respect to thedrum 1 that the drum has turned slightly more than a single revolutionor in conjunction with analyzing or reproducing in a longitudinaldirection with respect to the drum 1, as shown in the last namedcopending application, with the drum being advanced at the end ofeachstroke a line advance equal to the width of a single line ofanalyzing, or reproducing, or a plurality of lines of analyzing andreproducing in case of multiplex transmission, that it will be necessaryto entirely complete the transmission and reception of the picture imagein order to efect the recurrence of the combination that the slot in thedisk member 21 frictionally driven bymeans of the gear member 3 isyopposite the forked projection 33 at exactly the same instant that thescan- 5 ning or reproducing system completes a horizontal stroke. t

Thus, in either case, and irrespective of the type of analyzing orreproducing, it may readily be seen that it will only be at such a timewhen a complete picture has been transmitted and received that the relaycoil 31 will be energized at a time exactly corresponding to the timewhen the slot 23 on the disk member 21 is in such a position that theforked end 23 of the armature 25 may rest therein. Thus, the armature 25will never rest against the contact 51 except at times when the picturehas been completely transmitted, so that the` drum has either made aplurality of revolutions with an overlapping beyond a single completerevolution additively totaling another single revolution or when thedrum has been rotated through one single revolution in case of parallelline for line scanning.

Now, supposing that the disk 21 has been turned through either acomplete revolution 0r a plurality of revolutions having an overlappingtotaling fa single revolution, the forked projection 33 on the armature25 will rest in the slot 23 and the armature 25 will come to restagainst the contact point 51. At such a time, current which is connectedwith its positive terminal to the contact or pivotal 35 point 27, of thearmature 25 will flow through the contact point 27, the armature 25through the contact point 51 and the conductor 55,

- through an alarm system 51 and thence to the transmitter, and, ifdesired, through a relay system which may turn oif the transmitter orreceiver so thatpictures will no longer be sent or received.

A It may be seen, if the alarm system 57 is arranged in the form of abell and the transmitter has been turned olf by reason of the fact thatthe armature 25 has come to rest 0n the contact point 51, that theala-rm 57 will continue to indicate the end of the transmission.Therefore, if the alarm system 57 be a bell, it will continue to ring,or if it be a light, it will continue to glow, and the operator willobserve the indication and know that he must attend the machine andremove ythe transmitted or finished record therefrom so that anotherrecord may be substituted therefor. c

At starting position, when the relay 29 is operated by closing theswitch arm 39 upon the contact point 41, it will be seen that thearmature 25 will come to rest upon the con- 'tact point 53, and thuscurrent will flow from the positive source of potential through thecontact point 27 pivotally supporting arma ture 25, through the armature25 to the contact point 53 and thence to the` negative source ofpotential so as to control `by V,means of a differentially wound relayor the like the transmitter or receiver so as toturn the same on incontrast to` turning either the transmitter or receiver olf when thearmature 7o rests against the contact point 51.

Other modiiications of the arrangement herein disclosed and set forthwill at once suggest themselves to those skilled in the'art to which theinvention relates, and I,there 75 fore, desire tol be limited in so faras what modifications and changes I may make to this system only Ain sofar as the spirit and scope of the hereinafter appended claimsnecessitates. l

Having now described my invention, what I claim and desire to secure byLetters Patent isl the following: i j l. v .Y f

1. In a system for indicating the completion of the transmission` orreception of pictures, a rotating picture carryin drum for supporting apicture surface, a isk on the end of said drum and rotating therewith,said disk having anotched portion onjthe' peripherv thereof, a relayhaving an armature` v adapted to rest in the notched portion of saiddisk member at a predetermined position thereof, means for energizingsaidl relay at predetermined intervals during the period of rotation ofsaid drum, and means provided by the position of said armature Iwhenresting in said notched portion for .ener izing4 an v alarm circuit lforindicating the en of a single transmission of a picture. f v

2. In an alarm system for indicating the completion of the transmissionor reception of pictures, a rotatable picture carrying drum forsupporting a picture surface, a, disk with a single slot thereinfrictionally driven on the end of said drum, a relay havin'v an4 arma.-105 ture adapted to rest against saidv^ isk member, means for energizingsaid relay at prev determined intervals-during the rotation of said drumand causing said armature 'to bear against said disk, Aand'meansprovided by the 110 rotation of said drum'and disk forl permitting saidarmature to rest in said disk slot at the completion of a completetransmission and reception of a picture record, an alarm..

system for indicating the end of a transmission, and means provided bythe position of said armature when resting in said slotted lportion forenergizing said alarm circuit.

3. In an alarm system for indicating the completion of the transmissionor reception of a picture, a rotary picture carrying drum supporting asurface corresponding to a transmitted or received picture, a diskcarried on the end of said drumand rotating therewith, said disk havinga notch in the periphery thereof, a relay having an armature adapted torest in the notchedportion of said disk member at the point of startingand ending a single transmission, means for energizing said relay atpredetermined periods of 13 time during the rotation of said picturecarrying drum, an alarm system, and means provided by the position ofsaid armature when resting in said slotted portion for energizing 5 saidalarm circuit and thereby indicating the end of a single transmission ofa picture.

4. In a system for transmitting or receiving pictures, a picturecarrying drum for supporting a picture for transmission or reception, adisk having a notched portion about the periphery carried on the end ofsaid drum, a relay having an armature adapted to rest in the notchedportion of said'disk member at the time of starting ory endin saidtransmission, means for energizing said relay at each longitudinalmovement of a scanning system with respect to said drum, means forrotating said drum, and means provided by the rotation of said drum for.20 frictionally carrying said disk therewith,

and means provided by the energization of said relay for moving saidarmature against said disk, means provided by said single slot in saiddisk for permitting said armature to rest in the notched portion of saiddisk only at the beginning and then at the end of a completetransmission of the picture carried by said drum, and means provided bythe position of said armature when resting in said slotted portion forenergizing an alarm circuit for indicating the end of a singletransmission of a picture.

5. In a system for indicating the completion of the transmission orreception of pictures, a rotatable picture carrying drum, a diskprovided .with a notch about the periphery thereof mounted forrotational movement with said drum, and a relay and arma- *ture meanscooperating with said disk whereby uponenergization of said relay atpredetermined periods during the rotation of said drum said armature isadapted to rest in said notched portion of said disk at the end of acomplete picture transmission to indicate the end of transmission andreception.

6. A system for indicating the completion of a transmission of a picturewhich includes a picturev carrying element having a disk mounted on oneend thereof for simultaneous movement therewith, said disk beingprovided With a single slot about the periphery thereof, and an armatureand relay means cooperating With said disk and slotted portion thereoffor causing an indication of the completion of the picture during timeperiods when said armature rests in the slotted portion on said disk. i

RICHARD HOWLAND RANGER.

